linux-kernel - Re: [PATCH 7/15] dt-bindings: display: sun4i: Add allwinner,tcon-channel property

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Message-ID: <CAGb2v66o79wX9x4+ByNryoSOGrcixsbKKyDmfzeQcMAGLV_SBQ@mail.gmail.com>
Date:   Wed, 8 Mar 2017 11:38:48 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Chen-Yu Tsai <wens@...e.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH 7/15] dt-bindings: display: sun4i: Add allwinner,tcon-channel
 property

On Tue, Mar 7, 2017 at 4:56 PM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> The Allwinner Timings Controller has two, mutually exclusive, channels.
> When the binding has been introduced, it was assumed that there would be
> only a single user per channel in the system.
>
> While this is likely for the channel 0 which only connects to LCD displays,
> it turns out that the channel 1 can be connected to multiple controllers in
> the SoC (HDMI and TV encoders for example). And while the simultaneous use
> of HDMI and TV outputs cannot be achieved, switching from one to the other
> at runtime definitely sounds plausible.
>
> Add an extra property, allwinner,tcon-channel, to specify for a given
> endpoint which TCON channel it is connected to, while falling back to the
> previous mechanism if that property is missing.
>
> Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>

Acked-by: Chen-Yu Tsai <wens@...e.org>